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Keep your Edwards Signaling photoelectric air duct smoke detector in tip-top shape with this replacement air sampling tube! Made specifically for air ducts up to 6-1/2 ft. wide, this 6 ft. long and 1/2 in. wide tube will help you maintain accurate smoke detection in your building or facility. With a condensed manufacturer number of SDT78 and an MFR. No. SD-4WJ, this product is made by the trusted brand Edwards Signaling and is backed by their commitment to quality. Use it to replace damaged or worn tubes and ensure your smoke detection system stays up and running.